Telephone repeating device.



D. H. WLSDN.

-LT'aLHPHoNB REPEATING DEVICE: APPLIUATION FILED JAN. 2, 1918.

mmm may .26, 1914,

'neet'ion 15. `Aprimary coils 12 and 13 are brldged, as 1t were. across the mam line, and that when,

.entran maras- PATENT onirica.

DAVID H. WILSON, or NEW YonK, N. Y.

TELEPHONE REPETING- DEVICE.

Specification of Letters Patent.

Application filed January 2, 1913.

Patented May 26, 1914.

Serial No. 739,830. 4

To all wz/nit 11mg/ concern,

Be it known that I, Divin H. lYlLsoN, a citien ot the United States, residing at New York, in the county ot New York and State ot. New York, have invented a certain new and useful Improvement. in Telephone Repeating Devices, of which the following is a specification.

This invention relates to telephone repeating devices and has for its object to provide a new and improved device ot this description. A

The invention is illust-rated in the accompanying drawings, wherein- Figure l1 is a (.liagrammatic view showing one t'orm ofthe invention; Fig. 2 a dia.- granmiatic view showing a modified construction.

Like numerals refer to like parts throughout the. several iigures. l

Referring now to Fig. 1 herein ior purpose oli illustration l have shown diagrammatically one form o1' the invention. I have illustrated two separated telephone stations 1 and 2, which may he supplied with any desired instrun'ients. herein shown, these stations are provided with the'transmitters 3, source ot current supply 4 and induction coils with the primary coils 5 and secondary coils t3, there being receivers T in circuit with the secondary coiis. The two stations are connected together by the main line. circuits 8 and 9. Located at any suitable point is a repeatingfapparatus coi'nprising as it were three elements, one of these elements is an electromagnetic device and as illustrated in Fi. l is made up ot the cores 10 connected ther at their ends and the cores 11 conilh'ec ed together at their ends but separatev from the. cores 10. The cores Mare provided with the primary coils 12 and the cores 11 with the primary coils 13. All ot these coils are connected in series with eachother, and one end coil as, for example, one of the coils 12 is connected by theconductor 14 with one branch ot the main line circuit as, for example, the branch 8. The other end coil, as for example, one of the coils 13 is connected hy the conductor 15 with the other lfranch 9 ot the main line circuit, there being preferably a. condenser 16 in the con- It will thus be seen that these s a talking current in the main line, 'non thereof passes 'through these prlthe permanent magnet 22 and has its dia'- phragm arranged so as to be actuated hy'the poles of the permanent magnet. The cores 11 are provided with secondary coils 2T and 28. The coil 27 is connected in circuit With the coils 29 on the poles of the .pern'ianent magnet 30. The coil 28 is connected in circuit with the coils 31 on the poles of the permanent magnet 32. A transmitter 33 is associated with the permanent magnet 30 and arranged so that its diaphragm 34 is actuated by the poles thereof. A transmitter 35 is associated with the permanent magnet 32 and arranged so that its diaphragm 36 is actuated by. the poles of said magnet. The transn'iitter 23 is connected hy conductors 37 and 38 with the source of elect-ric supply 39 and the primary coil 40 on onel of the cores 41. The transmitter 25- is' connected by conductors 42 and 43 withthe source of electric supply 44 and the primary coil 45 on the other core 41. The two cores 41 are connected together. The cores 41 are provided with the secondary coils 4G and 47,also located on the cores 41. These secondary coils are connested in series and are connected to one branch ofthe main line circuit as, for eX- ample, the branch 8. The transmit-ter 33 is'connected by conductors 48 and 49 with the source of electric supply 50 and the primary coil 51 on one oit' the cores 52. The transmitter 35 is connected by conductors 53 and 54 with the primary coil 55 on the other,

core 52. The two cores 52 are connected together. The cores 52 are provided with the secondary coils 5G and 57. These secondary coils are connected in series and are .con-

nected in the branch 9 of' the main line cir- 7. VVhen-the device is in operation and the operator talks, for example, into one of the transmitters 3 at one of the stations 1 or 2, the talking current is set up in the main line and will pass thcrealong to the repeating apparatus. A portion of the current will then. pass by way of conductors 14 and 15 through the high wound primary coils 12- aiid'13 on the cores 10 and 11. These coi!-v aie preferably made up cfa large number ot turns o. fine wire. A talking current 'is thereby induced in each of the independent coils 17, 1S, 27 and 28. These coils are pret'- erably made up of a 'comparatively small number of turns of large wire and the current induced therein passes through the coils 19, 21, 29 and 31 on tothe poles of the permanentmagnets 20, 22, 30 and 32. These several currents then act simultaneously on ythe four transmitters 23, 25, 33 and 35. vA talking current is then simultaneously set up in the several primary circuits associated with said transmitters andin the' pri-mary coils 40, 45, 51 and 55. This talking current can easily be made a strong current by properly apportioning the circuits andl sources of electric su )ply and a strong talking current is there'y induced in the secondary coils 46, 47, 56 and 57 in the main line circuit thus greatly strengthening themain line talking current and greatly increasing its eiiectiveness. The cores 10 and 11 and their associated coils act as amplifiers and the permanent magnets with. the coils or bobbins thereon vand the transmitters are acted upon by the amplifier so as to produce a strong talking current corresponding with that in the main line, while the cores 41 and 52 and the coils thereon act as transformers or induction coils in the main line circuit to impress the strength ot' the talking current on the main line. vThe several coils are connected to the branches in the main line circuit so as to balance each other, that is, so as to produce a balanced condition.

In Fig. 1 I have shown a particular construction of my apparatus but it is, of course, evident that the parts may be varied in forni, construction and arrangement and some of the parts omitted and others used with parts not herein shown without departing from the spirit of my invention. In Fig. 2, for example, I have shown the amplifiers as having only the two primary coils 12 which are connected in series and connected by means of coiidensers to the two branches of the main line circuit intermediate the coils 46 and 47, and 56 and 57, there being only the two primary coils 17 and 18 and the two peri'nanent magnets 20 and 22 and the two trausinitters 23 and 25. The primary coils 40 and 45 of thc transformer are connected in series and in circuit with `the transmitter 23 while the primary coils By means of my present invention, I am enabled to very greatly increase the power and eiiiciency of the apparatus and to transmit the voice currents through much longer distances than heretofore.

1. A telephone repeating device comprising a main line circuit, a plurality of primary coils in series and connected across said main line circuit, a plurality of cores about which said primary coils are wound, a plurality of secondary coils on said cores,

a plurality of permanent magnets, coils on said magnets connected with said secondary coils, a plurality of transmitters associated with said permanent magnets so as to be actuated thereby, ,sources of eiectric supply connected incii'cuit with said transmitters, primary coils connected in circuit with said transmitters, cores upon which said primary coils are wound, two sets of secondary coils associated with said primary coils, one set connected with one branch lof the main line circuit, and the other set connected with tlieother branch of the main line circuit.

2. A telephone repeating device comprising a main line circuit, a series of coils connected with said main line circuit, cores about which said coils are wound, a second series of coils wound about said cores, a second set of cores separate from the first mentioned cores and provided with coils in circuit with said second set ot coils, transmitters associated with said latter cores so as to he actuated thereby, a .third set of cores containing primary and secondary coils, the primary coils connected vin circuit with said transmitters, sources of electric supply in said circuit, the said secondary coils connected in circuit with the main line.

3. telephone repeating device comprising4 a main line circuit, a series of coils connected with said main line circuit, cores about which said coils are wound, a second series of coils wound about said cores, a second set of cores separate from the first mentioned cores and provided with coils in circuit with said second set of coils, transmitters associated with said latter cores so as to be actuated thereby, a third set of cores containing primary and secondary coils, the primary coils connected in circuit with said transmitters, source of electric supply in said circuit, the said secondary coils connected in circuit with the main line, said secondary coils divided into two sets, the coils of each set in series with each other, the coils of one set connected with one branch of the main line circuit and the coils of the other set connected with the other branch thereof.

. 4. A telephonev repeating device comprising a main line circuit, a plurality of prisaid primary coils are wound, a plurality' of independent secondary coils on said cores, a plurality ot permanent magnets, separate coils on said magnets, each olf said coils connected with one oi said secondary coils and a transmitter associated with each permanent magnet so as to be actuated thereby, a primary coil connected in circuit with each transmitter, a source ot' electric supply in nach of said'circuits, two sets of cores about which said primary coils are wound, the secondary coils on each set being connected in series, the primary coils being independent of each other, the said secondary coils being connected in the main line circuit.

5.l A telephone repeating device comprising' a main line circuit,'an amplilier provided with coils connected to the main line circuit and coils separate -from the main line circuit, permanent magnets, coils thereon in circuit with the coils of the amplifier separate from the main line circuit, transmitters associated with the said permanent magnets so as to be actuated thereby, an induction coil provided with primary and secondary coils. the primary coils connected with said transmitters, sources'otf electric supply in circuit therewith, the secolnlary coils connected'with the main aine circuit.

(l. A telephone repeating device comprisings,r a main line circuit, a primary coil connectcd with said circuit, a core therefor, aA

secondary coil wouud about said core, a permanent magnet, a coil on said permanent magnet, said vcoil connected in circuit with said secondary coil, a transmitter associated with said permanent magnet, an induction coil comprising primary and secondary Losigeeo 3 coil, the primary coil connected in circuit with said transmitter, a source of electric supply in said circuit, the secondary coil connected with the main line circuit.

7. A telephone repeatinfr device comprising a main line, an ampli ying device associated therewith having a primary and sec# ondary coil, two induction coils associated with the main line circuit, each having a primary and secondary coil, the secondary coils of said induction coils forming two independent circuits.

8. fr telephone repeating device comprising a main line circuit, a plurality of primary coils in series and connected across 'said main line circuit, 'a plurality of cores about which said primary coils are wound,

four secondary coils on said cores, four pen' marient magnets, coils on said permanent magnets, connected with said secondary coils, four transmitters, one associated with each permanent magnet so as to be actuated thereby, a separate source of electric supply, connected in circuit with each of said transmitters, the primary coils connected in circuit with said transmitters, two sets of secondary coils associated with said primary coils. oneset connected with one branch or' themain line circuit and the other set connerted with the other branch of the main line circuit.

ln testimony whereof, I ailix my signature -in the presence of two witnesses this Qith day'of December 1912.

. DAVID H. WILSON.

Witnessesu Corni M. WILSON, JOHN'R. DAVIDSON. 

